Download App

13. oscillations — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics13. oscillations1 Mark
MCQ
A simple pendulum is attached to a block which slides without friction down an inclined plane $A B C$ having an angle of inclination $\alpha$ as shown below. While the block is sliding down the pendulum oscillates in such a way that at its mean position the direction of the string is
  • A
    at angle $\alpha$ to the perpendicular to the inclined plane $A C$
  • B
    parallel to the inclined plane $A C$
  • C
    vertically downwards
  • ✓
    perpendicular to the inclined plane $A C$
✓

Answer

Correct option: D.
perpendicular to the inclined plane $A C$
d
(d)

As block slides down the plane, pendulum bob is subjected to two forces.

$(i)$ Weight mg perpendicularly downwards to the horizontal.

$(ii)$ Pesudo force $m g \sin \theta$ acting upwards and parallel to the inclined plane.

Resultant of these forces is perpendicular to inclined plane $A C$. So, mean position of pendulum is perpendicular to $A C$.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 13. oscillations→13. oscillations — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

The number of significant figures in the amount $201,00,000$ is:
→
The $r.m.s.$ speed of a certain gas is v at $400\,K.$ The temperature at which the $r.m.s.$ speed becomes two times, will be ...... $K$
→
On a horizontal frictionless frozen lake, a girl $36 \,kg$ and a box $9 \,kg$ are connected to each other by means of a rope. Initially, they are $20 \,m$ apart. The girl exerts a horizontal force on the box, pulling it towards her. How far has the girl travelled when she meets the box?
→
Two identical solid copper spheres of radius $R$ placed in contact with each other. The gravitational attracton between them is proportional to
→
A projectile is fired from level ground at an angle $\theta $ above the horizontal. The elevation angle $\phi $ of the highest point as seen from the launch point is related to $\theta $ by the relation
→
The linear speed of a uniform spherical shell after rolling down an inclined plane of vertical height $h$ from rest, is:
→
A body is projected up with a speed $'u'$ and the time taken by it is $T$ to reach the maximum height $H$. Pick out the correct statement
→
Two projectiles are thrown simultaneously in the same plane from the same point. If their velocities are $v_1$ and $v_2$ at angles $\theta _1$ and $\theta_2$ respectively from the horizontal, then answer the following question

If $v_1 = v_2$ and $\theta _1 > \theta _2$, then choose the incorrect statement

→
Three particles of masses $10\;g, 20\;g$ and $40\;g$ are moving with velocities $10\widehat i,10\widehat j$ and  $10\widehat k\;m/s$ respectively. If due to some mutual interaction, the first particle comes to  rest and the velocity of second particle becomes $\left( {3\widehat i + 4\widehat j\,\,} \right)\, m/s$, then the velocity of third particle is
→
A solid disc of mass $M$ is just held in air horizontally by throwing $40$ stones per sec vertically upwards to strike the disc each with a velocity $6\,m{s^{ - 1}}$. If the mass of each stone is $0.05\,kg$ what is the mass of the disc  ........... $kg$     $(g = 10\,m{s^{ - 2}}$)
→